Adjustable chair



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' ADJUSTABLE CHAIR Filed Feb. 9, 1956 5 Sheets-Sheet 5 IN VEN'TOR.

nited States ADJUSTABLE CHAIR Peter Stewart Fletcher, Boynton Beach, Fla, assignor to Anton Lorenz, Boynton Beach, Fla.

Filed Feb. 9, 1956, Ser. No. 564,474

13 Claims. (Cl. 15S106) This invention relates to chairs of the adjustable type which may be adjusted between an upright or sitting position and a tilted position, as the user may desire.

An object of the invention is to provide an improved and novel mechanism for elevating a leg supporting platform or leg rest from a normal inactive position beneath the seat, into an elevated position in front of the seat whenever the chair is operated into a tilted position, and to retract the leg rest when the chair is again adjusted into its normal sitting position; which will utilize lazy tong mechanism of a novel arrangement; and which will automatically elevate the seat at its forward edge when the back rest is moved into its tilted position; which will be relatively simple, compact, practical, durable and inexpensive, and in which the leg rest may be easily disposed in the space beneath the seat.

Other objects and advantages will be apparent from the following description of several embodiments of the invention, and the novel features will be particularly pointed out hereinafter in connection with the appended claims.

In the accompanying drawings:

Fig. 1 is a side elevation, partly in section, of a chair constructed in accordance with this invention, the side of the chair nearest the Viewer being removed to show the linkage beneath the seat;

Fig. 2 is a similar view, but with the parts in their tilted positions;

Fig. 2a is a schematic diagram illustrating the lazy tong mechanism for elevating or retracting the leg rest;

Fig. 3 is a view similar to Fig. 1, but illustrating a modification of the linkage;

Fig. 4 is a view similar to Fig. 3, but with the parts in their tilted positions;

Fig. 4a is a schematic diagram illustrating the lazy tong linkage employed in Figs. 3 and 4;

Fig. 5 is a view similar to Figs. 1 to 3, but illustrating another embodiment of the invention, with the chair in its sitting position;

Fig. 6 is a view similar to Fig. 5, but with the pants in their tilted position;

Fig. 6a is a schematic diagram illustrating the linkage mechanism of Figs. 5 and 6;

Fig. 7 is a view similar to Fig. 1, but illustrating another embodiment of the invention;

Fig. 8 is a view similar to Fig. 7 of the same embodiment, but with the parts in their tilted positions;

:Fig. 8a is a schematic diagram illustrating the linkage mechanism employed in Figs. 7 and 8;

Fig. 9 is a View similar to Fig. 5, but employing still another modification of the linkage and mounting of the seat and back rest; and with the parts in the normal sitting positions;

Fig. 10 is a view similar to Fig. 9, but with the pants in their tilted positions; and

Fig. 10a is a schematic diagram illustrating the linkage employed in Figs. 9 and 10.

In the embodiment of the invention illustrated in Figs.

ice

1, 2 and 2a, the chair includes a support 1, a seat 2 and a back rest 3, the support having spaced side membets 4 between which the seat and back rest are disposed and mounted on a common pivot 5, this pivot 5 being at the rear of the seat 2 and at the bottom of the back rest 3. The back rest 3 is provided with a depending arm 6 which is disposed below the common pivot 5 so that this arm 6 will oscillate with the back rest 3 and serve to actuate a lazy tong device to be presently described, through an actuating link 7. A leg rest 81 is disposed beneath the forward edge of the seat 2, but is mounted on a lazy tong device at each side of the seat, so that when the lazy tong devices are operated, the leg rest 8 will be projected forwardly and upwardly into the positions shown in Fig. 2, at the forward edge of the seat 2.

This invention includes a lazy tong device at each side of the seat, formed of three pairs of links, of which the leg rest 8 forms one end, and the links at the other end of the lazy tong device are connected, one to the chair support 1 and the other to the seat 2. This lazy tong device includes links 9 and 10 hinged together at 11 at each side of seat 2, with the link 9 hinged at 12 to the support 1 and the link 10 hinged at its free end by pin 13 to the leg rest 8. Links 14 and 15, at each side of seat 2, hinged together at 16, form another pair of links, and one end of the link 14 is hinged at 17 to a lug depending from the lower side of the seat 2. The links 18 and 19, hinged together at 20, form still another pair of links at each side of the seat, and the link 19 is hinged at 2-1 to the leg rest 8 at a point below the hinge connection 13.

The link 18 is connected by a pin 22 to the free end of the link 15, and the link 14 is pivotally connected by pin 23 to the link 10 intermediate of its ends. The link 13 is extended above the pin 22 and the extension pivotally connected by pin 24 to the link 10 between the leg rest connection and the pivot pin 23. This provides three quadrilateral linkages connected in tandem to form a lazy tong device at each side of the seat, with the leg rest at one end, and the support 1 and the seat 2 at the other end, and therefore, operation of any link in this lazy tong device will cause an extension or contraction of it to raise or lower the leg rest 8. The link 7, which actuates the lazy tong device when the back rest 3 is rocked into its tilted position, is connected by pin 25 to the link 9, so that whenever the back rest 3 rocks from the Fig. 1 to Fig. 2 position, it will cause the lazy tong device to be extended and elevate the leg rest 8. When the back rest 3 returns to its upright position, it will similarly, by reverse action, retract the leg rest 8 to its normal inactive position at the front end of the seat 2.

At each side of the seat 2, a link 26 is connected at one end by pin 27 to the lower part of the seat 2, and at its other end is pivctally connected by a pin 28 to the link 9 between the pivot 12 and the pin 25. When the back rest 3 is moved into its tilted position of Fig. 2, the link 9 will be rocked clockwise in Figs. 1 and 2 from its position shown in Fig. 1 to the position shown in Fig. 2, and this movement through the link 26 will elevate the forward edge of the seat 2 into the position shown in Fig. 2. When the back rest is returned to its upright position of Fig. 1, this action will lower the forward edge of the seat 2 into the Fig. 1 position. The link 26 thus acts as a support for the forward part of the seat 2, and the leg rest 8 through the lazy tong device is supported jointly by the support 1 and the forward part of the seat 2.

In the embodiment of the invention shown in Figs. 3 and 4, the arrangement is similar to that shown in Figs. 1 and 2 insofar as the seat and back rest and their mounting on the support 1 are concerned, and similar parts are identified by similar numerals. The support 1 includes cross members 29 and 30, in both Figs. 1 and 2 as well as Figs. 3 and 4. The leg rest 8 is normally disposed beneath the forward edge of the seat 2 as in Figs. 1 and 2, but is mounted on a lazy tong device of which it forms one end, with the other end of the lazy tong device completed by the support 1 and the seat 2 in a manner similar to that explained for Figs. 1 and 2. Thus at each side of the seat 2 there is a lazy tong device formed of three pairs of links which are interconnected into the lazy'tong device composed of three quadrilaterals of links interconnected in tandem and supported jointly by the seat and the support, as explained for Figs. 1 and 2.

The linkage arrangement of the lazy tong device in Figs. 3 and 4 differs slightly from that shown in Figs. 1 and 2. Links 31 and 32 hinged together at 33 form one pair of the links of the lazy tong device, and at one end the link 31 is hinged at 34 to the support 1. Links 35 and 36 which are hinged together at 37 form another pair of links of the lazy tong device, and one end of the link 35 is pivotally connected by pin 38 to the lower face of the seat 2. The links 32 and 35 are pivotally connected together at 39. Links 40 and 41, hinged together at 42, for still another pair of links, and the free end of link 41 is connected by a pivot pin 43 to the leg rest 8. The link 36 is connected at its free end by pin 44 to the leg rest 8 below the pin 43, and the free end of the link 40 is connected by pivot pin 45 to the free end of the link 32. The link 40 extends beyond its hinge 42, and this extension is pivoted by pin 42a to the link 36 intermediate of the ends of the latter. A guiding link 45a is hinged at one end by pin 45b to the support 1, and at its other end it is hinged by pin 450 to the link 32 intermediate of the ends of the latter. The links 31 and 45a, which are carried by the support 1, serve to support the link 32 and cause it to pursue a selected, endwise path when the actuating link 7 is operated from the back rest 3. Since the link 32, thus carried by links 31 and 45a from the sup port 1, and the link 35 that are hinged together by pin 39, are part of the lazy tong device that supports the leg rest, the link 35 which extends beyond pivot pin 39 to its hinged connection to the seat at pin 38, will serve to raise the forward part of the seat when the leg rest is raised and advanced concurrently with the rearward tilting of the back rest 3. The seat is therefore, a support for the lazy tong device, yet the latter also causes the seat to rise at its forward edge when the lazy tong device is extended by the operation of the back rest into its tilted position. This provides a lazy tong arrangement of three quadrilateral linkages connected in tandem, with the leg rest forming one end of the lazy tong device and the seat and support forming the other end thereof.

The lazy tong arrangement when in operation will be extended or contracted so as to elevate the leg rest 8 into an inclined position in front of the seat 2 or retract it into its normal, retracted position below the forward edge of the seat 2. The actuating link 7, which is operated endwise by tilting of the back rest 3, is connected by a pivot pin 46 to the link 31 intermediate of its ends, and thus when the back rest is rocked from the Fig. 3 position to the Fig. 4 position, this actuating link 7 will extend the lazy tong device and elevate the leg rest 8 into the position shown in Fig. 4. When the back rest 3 is returned to its upright position shown in Fig. 3, the actuating link 7 will retract the lazy tong device and return the leg rest 8 to its position as shown in Fig. 3.

In the embodiment of the invention shown in Figs. and 6, seat 2 and back rest 3 are formed as a rigid unit which is pivotally mounted at each side by a pin 47 on the upper end of a lever 48 which is hinged on a pin 49 carried by the support 1. The leg rest 8 is normally disposed beneath the forward edge of the seat 2, as in Figs. 1 to 4, and the lower end of the lever 48 is pivotally connected by a pin 50 to an actuating link 51 which corresponds to the actuating link 7 of Figs. 1 to 4. The leg rest 8 is supported on a lazy tong device of links somewhat similar to that shown in Figs. 1 to 4, in that the leg rest 8 forms one end of the lazy tong device and the support 1 and seat 2 form the other end. of the lazy tong device. The linkage of this lazy tong device which is provided at each side of the seat 2 includes a pair of links 52 and 53 (Fig. 6a) which are hinged together at 54. The link 52 is also hinged by pin 55 to the support 1.

Links 56 and 57, hinged together at 58, form another pair of links, and the link 56 is connected by a pin 59 to the seat 2. The link 57 at its free end is connected by a pivot pin 60 to the leg rest 8. Links 61 and 62, hinged together by hinge 63, form another pair of links, the link 62 being hinged. at 64 to the leg rest 8, and the link 61 being hinged at 65 to the free end of the link 53. The link 61 is extended beyond its hinge 63 and is pivotally connected by a hinge 67 to the link 57 intermediate of its ends. This provides again three quadrilaterals of linkages connected in tandem and forming a lazy tong device, with-the leg rest 8 at one end of that device and the seat and support.

forming the other end of it, so that the operation of any link of these three pairs will cause an extension or contraction of the lazy tong device to elevate or lower the leg rest 8. The actuating link 51 is pivotally connected by pin 68 to the link 56 between the seat and a pivot pin 66,. which also hinges the right hand end of an extension of link 53 to the link 56. In this embodiment, a link 68a is pivoted by pin 59 to the seat well forwardly of the connection to the seat of the lever 48, and the lower end of link 68a is pivotally connected by a pin 68b to a lug 680 on a cross member 68d of the support 1. This guiding link 68a, at each side of the seat, supports the forward part of the seat and moves through vertical dead center position as it moves with the seat between sitting and tilted positions.

In the embodiment of the invention illustrated in Figs. 7 and 8, the seat 2 and back rest 3 are pivoted upon a common pivot or rod 69 which is carried by the support 1, and the back rest 3 is provided with a depending arm 70 which, at its lower end, is pivotally connected by pin 71 to one end of a control link 72. The leg rest 8 is again supported upon three pairs of links at each sideof the seat 2, and interconnected to form three quadrilaJterals of links forming a lazy tong device, with the leg rest 8 at one end'and the support and seat 2 at the other end. The links 73 and 74, which are hinged together by hinge 75, form one pair of links, and the link 73 is connected by a pivot pin 76 to a lug on the seat 2.

at a point below the pin 81. The link 82 is pivotallyconnected by pin 86 to the freeend of the link 74 of the first pair of links. The link 82 is provided with an extension beyond the pin 86, which extension is pivotally connected by pin 87 to the link 78 intermediate of its ends. The link 77 extends beyond its hinge 79 and is pivotally connected by pin 88 to the link 74 interme-- diate of its ends. The control or actuating link 72 is pivotally connected to the link 73 by pin 89. Thus leg rest 8 is mounted on one end of the lazy tong device, formed of three quadrilaterals of links, which is supportedat" the end opposite from the leg rest 8 jointly on the seat 2 and the support 1, and actuated into extensible position by the link 72 when the back rest 3 is rocked into its, tilted position shown in Fig. 8. When therback rest'returns to its upright position shown in Fig. 7, the link 72 is retracted and returns the leg rest to its normal in--' active position shown in Fig. 7.

A guiding link 90, Fig. 7, is hinged at one end by. pin to support 1 and at its other end is pivotally connected by a pin 92 to the actuating or control link 72 intermediate of the ends of the latter, with the link 90 in approximately vertical position when the seat and back rest are in their sitting positions shown in Fig. 7. When the actuating link 72 is moved to the left in Fig. 7, the pin 92 will have some movement upwardly during the arc of movement, as shown in Fig. 8, and this will cause the pin 89 on the link 72 to also rise, which will raise the link 73 which is hinged to the seat 2, and thus also elevate the seat 2 at its forward edge, by rocking seat 2 on its pivot 69. When the back rest returns to its upright or sitting position, the pin 92 will descend and thus permit the forward part of seat 2 to descend.

In the embodiment of the invention illustrated in Figs. 9 and 10, the back rest 3 and the seat 2 are formed in a rigid unit as in Figs. 5 and 6, and disposed between the side members 4. The combined seat and back rest at each side is carried by a pivot pin 93 on whichone end of a lever 94 is pivoted, the other end of lever 94 being pivoted on a pivot pin 95 which is carried by the support 1. The seat 2, at each side and midway between its front and rear, carries a depending lug 96 having therein a slot or aperture 97 which extends in a direction from front to rear of the seat. A bearing rod 93 is carried by the side members 4 of the support 1 and on this rod 98 a link 99 is pivotally mounted. The link 99 extends above the bearing rod 98, and this extension is pivotally connected by pin 100 to one end of a link 101, the other end of that link being pivotally connected by pin 93 to the seat and back rest, and to the upper end of the link 94. This pin 98 extends through and is slidable along the slot 97, so as to support the seat in this manner, yet the seat can slide endwise on the rod 98 to the extent permitted by the slot 97.

The leg rest 8 is normally disposed below the front edge of the seat 2, and is mounted on one end of, and forms part of, a lazy tong device by which it may be elevated into the leg supporting position shown in Fig. 10. The linkage of this lazy tong device is illustrated schematically in Fig. a. Links 99 and 102, which are hinged together at 103, form one pair of links at each side of the seat, and link 102 is pivotally connected by a pin 104 to the leg rest 8. Links 105 and 106 which are hinged together at 107 form another pair of links at each side of the seat 2. The link 105 is pivotally connected by pin 108 to the seat 2, adjacent its forward edge, and by pin 102a to the link 102 between the pins 104 and 114. Links 109 and 110, which are hinged together at 111, form another pair of links at each side of the seat 2. The link 109 is pivotally connected by a pin 112 to the leg rest 8 below the pin 104, and the link 110 is pivotally connected by pin 113 to an end of the link 106. The link 110 extends beyond its pin 113, and is pivotally connected by pin 114 to the link 102 intermediate the ends of the latter.

These three pairs of links at each side of the seat thus constitute another type of lazy tong device which supports the leg rest 8 jointly by the seat and support and is operable when extended to elevate the leg rest from the Fig. 9 posit-ion to the Fig. 10 position. The link 99 of this lazy tong device is operated by the control link 101 whenever the combined seat 2 and back rest 3 are rocked rearwardly on the pin 95.

It will be observed that in each illustrated embodiment of the invention, there are three pairs of links at each side of the seat, which may for convenience of reference be identified as the first, second and third pairs of links. The links of each pair are pivoted to each other. Each first pair of links has one of its links pivoted to the leg rest and the other pivoted to some pant of the chair. Each second pair of links is that pair which is pivoted to some part of the chair, and to one link of the third pair of links whose other link is in turn pivoted to the legrest. The three pairs of links are operatively interconnected to form a lazy tong device by some means which includes at least one extension of one of the links of a pair.

In Figs. 1 and 2, the first pair comprises links 9 and 10, the second pair comprises links 14 and 15, and the third pair comprises links 18 and 19. The extension of one of the links is the extension 18E (see Figs. 1 and 2a) of the link 18 of the third pair. In Figs. 3 and 4, the first pair of links includes links 35 and 36, the second pair includes links 31 and 32, and the third pair of links includes links 40 and 41. The extension is the extension 4015'. of link 40, see Fig. 4a. In Figs. 5 and 6, the first pair of links comprises links 56 and 57, the second pair of links comprises links 52 and 53, and the third pair of links comprises links 61 and 62. The extension of one of the links of one pair can be either that part 61E of link 61 below pivot pin 63 or that part 53E of link 53, which is between the hinge 54 of that pair and the pin 66 that couples the extension of link 53 to the link 56. In Figs. 7 and 8, the first pair of links comprises links 77 and 78, the second pair comprises links 73 and 74, and the third pair comprises links 82 and 83. The extension of the links of a pair in this system can be either the lower part 77E of link 77 below the hinge 79, or the upper part 8213. of link 82 above the pin 86 that conples the link 82 to the link 74.

In Figs. 9 and 10, the first pair of links comprises links 99 and 102, the second pair comprises links and 106, and the third pair comprises links 109 and 110. The extension of one of the links of a pair is the extension 110E of the link 110 above the pin 113 that couples link 110 to link 106.

In all of the embodiments of the invention the linkage illustrated is provided at each side of the seat, and the two lazy tong devices at opposite sides of the seat are connected together by the leg rest 8 and the seat frame 1. Suitable stops, not shown, may be suitably positioned to limit the movements of the seat and back rest to the sitting and tilted positions.

It will be understood that various changes in the details and arrangements of parts, which have been herein described and illustrated in order to explain the nature of the invention may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims.

I claim:

1. A tiltable chair comprising a support, a backrest, a seat, a leg rest below the front of said seat, said backrest and seat being mounted on said support for movement between sitting positions and tilted positions, three pairs of links at each side of said seat, the links of each pair being hinged together, a first pair of said three pair of links having one link pivoted to said leg rest and its other link pivoted to one of said support and said seat, a second pair of said three pairs of links having one link pivoted to the other one of said seat and said support, and the remaining pair of links of said three pairs having one link pivoted to said leg rest and its other link acting as a floating link free of direct connection to said seat and said support and pivoted to the other link of said second pair and also pivoted to said one link of said first pair all of said three pairs of links supporting said leg rest and controlling and affecting the path of movement of said leg rest, and an additional actuating linkage operated by said backrest and articulately connected to a link of one of said pairs which is connected to one of said seat and said support, and effective upon movement of said backrest into its tilted position to actuate said three pairs of links and advance and elevate said leg rest to a position in front of said seat.

2. The chair as set forth in claim 1, wherein said first pair of links has its said other link pivoted to said support.

3. The chair as set forth in claim 1, wherein said actuating linkage is articulately connected directly to said other link of said first pair of links.

4. The chair as :set forth in claim 1, wherein said first pair of links has its said other link pivoted to said support and to said actuating linkage. 5. .A tiltable-chaircomprising a support, a backrest, a seat, a leg rest below the front of said seat, said backrest and seat being mounted on said support for movement between sitting positions and tilted positions, three pairs of links at each side of said :seat, the links of each .pair being rhinged together, a first pair of said three pairs of links having one link pivoted to said leg rest and its other link pivoted to "one of said support and :said seat, a second pair of said three pair of links having one link pivoted to the other one of said seat and said support, and the remaining pair of .links of said three pairs having one link pivoted to said leg rest and its other link pivoted to the other link of said second pair, an extension of one of the links of said pairs beyond one of its pivotal connections extending to a link of another pair and acting as a coordinating connection, another coordinating connection, said connections being located between one link of the first pair and one link of the second pair and between said one link of the first pair and a link of the third pair and an additional actuating linkage operated by said backrest and articula'tely connected to a pair which is connected to one of said seat and said support, and effective upon movement of said backrest into a tilted position to actuate said three pairs of links and advance and elevate said leg rest to a position in front of said seat.

6. A tiltable chair comprising a support, a backrest, a seat, a leg rest below the front of said seat, said backrest and seat being mounted on said support for movement between sitting positions and tilted positions, three pairs of links at each side of said'seat, the links of each pair being hinged together, a first pair of said three pair of links having one link pivoted to said leg rest and its other link pivoted to one of said support and said seat, the second pair of said three pairs of links having one link pivoted to the other one of said seat and said support, and the remaining pair of links of said three pairs having one link pivoted to said leg rest and its other link pivoted to the other link of said second pair, an extension of one of the links "of said pairs beyond one of its pivotal connections extending to 'a link of another pair and actting as a coordinating connection, another coordinating connection, said connections being located between one link of the first pair and one link of the second pair and between the other link of the first pair and a link of the third pair and additional actuating linkage operated by said backrest and articulately connected to a link of a pair which is connected to one of said seat and said support, and effective upon movement of said backrest into a tilted position to actuate said three pairs of links and advance and elevate said leg rest to a position in front of said seat.

7. A tiltable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, three pairs of links at each side of said seat and articulately interconnected to each other, including an extension of one of the links of one of said pairs beyond its interconnection to the other link of that pair which is pivotally connected to a link of another pair, to form an extensible lazy tong device, said leg rest forming one end of said device and supported thereby, one link of the other end of said device being hinged to said seat and the other link of said other end of said device being hinged to said support, an actuating link connected between said back rest and one of the links of said lazy tong device for causing an extension of said lazy tong device and elevation and forward movement of said leg rest whenever said back rest moves from its sitting position into its tilted position, and for retracting said leg rest when the back rest returns to its sitting position, and a link articulately connected to the forward part of said seat and to said lazy tong device for elevating the .forward part of said seat when the back rest is moved into its tilted position.

8. A tiltable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, an extensible lazy tong device at each side of the seat, supporting, at one end thereof said legrest-and at its other end supported by one of said seat and support, each said device being formed of three pairs of pivotally interconnected links, one pair having one of its links pivoted to the leg rest and the other of its links to one of said seat and support, a second pair of said links having one of its links pivoted to one of said seat and said support and its other link pivoted to one link of said third pair of links, with the other link of said third pair pivoted to said leg rest, a link of one of said pairs having an extension beyond its pivotal connection to the other link of that pair which is pivoted to a link of another pair, one of said links which is pivoted to one of said seat and said support being connected to the seat and the other to said support, and a connection to said device operable by said back rest, for causing an extension of said device when the back rest is tilted b-ackwardly and a retraction of said device when the back rest returns to sitting position.

9. A tiltable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, an extensible lazy tong device at each side of the seat, supporting, at one end thereof, said leg rest and at its other end supported by one of said seat and support, each said device being formed of three pairs of pivotally interconnected links, one pair having one of its links pivoted to the leg rest and the other of its links to said support, a second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said third pair or" links that is in turn extended beyond its pivotal connection to the other link of that pair and pivoted to that link of said first pair which is pivoted to the leg rest, the other link of said third pair of links being pivoted to said leg rest, and a connection operable by the movement of said back rest and seat between tilted and sitting positions for causing an extension of said device when the back rest moves into its tilted position and retracting said device when the backrest returns to its sitting position.

10. A tiltable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, an extensible lazy tong device at each side of the seat, supporting, at one end thereof, said leg rest and at its other end supported by one of said seat and support, each said device being formed of three pairs of p-ivotally interconnected links, one pair having one of its links pivoted to the leg rest and the other of its links to said seat, a second pair of links having one of its links pivoted to said support, and its other link pivoted to one link of a third pair, the other link of said third pair being pivoted to said leg rest, said one link of said third pair having an extension beyond its pivotal connection to the other link of that third pair pivoted to that link of said first pair which is pivoted to said leg rest, and a connection operable by the movement of said backrest for causing an extension of said device when the back rest moves into its tilted position and a retraction of said device when the back rest returns to its sitting position.

11. A tiltable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, an extensible lazy tong device at each side of the seat, each formed of three pairs of links, and supporting, at one end thereof, said leg rest and at its other end supported by one of said sea-t and support, each said device being formed of three pairs of pivotally interconnected links, one pair having one of its links pivoted to the leg rest and the other of its links to said support, a second pair of links having one of its links pivoted to said leg rest, and its other link pivoted to one link of a third pair, the other link of said third pair being pivoted to said seat, said one link of said second pair having an extension beyond the pivot to the link of that pair pivoted to that link of said first pair which is pivoted to said leg rest, and a connection articulately connecting said back rest and a link of one of said pairs and operable by the movement of said back rest for causing an extension of said device when the back rest moves into its tilted position and a retraction of said device when the back rest returns to its sitting position.

12. A tiltable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, an extensible lazy tong device at each side of the seat, supporting, at one end thereof, said leg rest and at its other end supported by one of said seat and support, each said device being formed of three pairs of pivotally interconnected links, one pair having one of its links pivoted to the leg rest and the other of its links to said support, a second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said third pair of links that is in turn extended beyond its pivotal connection to the other link of that third pair, and pivoted to that link of said first pair which is pivoted to the leg rest, the other link of said third pair of links" being pivoted to said leg rest and a connection articulately connecting said back rest and a link of one of the first two pairs which is connected to one of said seat and said support, and operable by the movement of said back rest and seat between tilted and sitting positions for causing an extension of said device when the back rest moves into its tilted positions and retracting said device when the back rest returns to its sitting position.

13. A tilt-able chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, an extensible lazy tong device at each side of the seat, supporting, at one end thereof, said leg rest and at its other end supported jointly by said seat and said support, each said device being formed of three pairs of pivotally interconnected links, one pair having one of its links pivoted to the leg rest and the other of its links to said support, a second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said third pair of links that is in turn extended beyond its pivotal connection to the other link of that third pair and pivoted to that link of said first pair which is pivoted to the leg rest, the other link of said third pair of links being pivoted to said leg rest, and a connection between said back rest and one of the links of said device and operable by the movement of said back rest and seat between tilted and sitting positions for causing an extension of said device when the back rest moves into its tilted position and retracting said device when the back rest returns to its sitting position.

References Cited in the file of this patent UNITED STATES PATENTS 195,395 Pope Sept. 18, 1877 2,617,470 Lorenz Nov. 11, 1952 2,664,942 Spear Jan. 5, 1954 2,693,845 Hoffman Nov. 9, 1954 2,750,988 Luckhardt June 19, 1956 

